Forming the interior space with clever use of light is what defines the pyronova proposal. A renovated administrative part is in an existing hall, which is partially recessed into the ground, creating greater demands on the illumination of the office space. The central space is a lobby with reception. This is the main dynamic element determining the quality of the space. Airy space is supported by floor in bright shades and a visual merge of offices with meeting rooms. The entrance hall is connected to the next part of the interior, defined by spatial volumes. Their positioning is an important element of the design: it creates a pleasant place for daily work. Straightforward orientation, human scale, light and material gradient emphasizes the corporate hierarchy. The building was additionally insulated into low-energy standard. The technology of heat recovery ventilation is applied.